There are substantial differences between Clojure's constellation of protocols/records/multimethods and CLOS, but at least the feature of CLOS that you cite is

There are substantial differences between Clojure's constellation of protocols/records/multimethods and CLOS, but at least the feature of CLOS that you cite is exactly what multimethods in Clojure do, see: https://clojure.org/reference/multimethods https://clojure.org/reference/multimethods